I am not sure who did your install but I have had several wet installations done by the Ghost Armor people and also several that I have done myself and I never had an issue with water affecting the speaker. Water is applied as spray mist and unless someone douses the protector in a bucket of water should not have any effect on your device. Furthermore, a professional installer will apply the wet install and then immediately put the phone into the heating units at the kiosk to eliminate all moisture.
There is a 7 day warrantee where GA will replace and re-install for free if there were any issues with the original install.